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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f236954e1942baefc657ddebdf245fe712659b9e6264ecfd34e0ab6c572314fd' 
  AND token = '1le2cmZVCN43FdIRjaVaoB9tNCRS6iB1K/llvc9SULQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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