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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ab8105892e26bb8bff2de9e687d74d0efcaa09142e42c34fd32580b88284cd' 
  AND token = 'M9mRd4+q4eFoQOJzy3Z01HpiKRHsPnzfvRaaON3ap/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}