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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc37dd66eede9a571f95ac313478ac1a60bf431449170c6bce7c4863e57563e' 
  AND token = 'fmuosAgwHNxEwYgUva01Mj/GnmcVnUb1TseVjkVl60Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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