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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d14ab2d629249f7833089d067e6efb5c1b338751974d4fc18d8d58a8964395' 
  AND token = 'as95A6Wk0bXgriuQPeMeq/FdKY0pUUaRyMI4Tp23PXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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