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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7512ff6a024d069a1ad102f5d41c9347a4034fcf27644720b96b4ae04df2d449' 
  AND token = '6pKyOvh+GeXfyMkLohDuLBRsMHtCJRMaPLaTCTRc1Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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