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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c118bda299e5bb594e5a90d82e8c6fd8cd235adffc1c49f559fbfdfa6942f8c' 
  AND token = '8FycXbmwwfXH4CGZwk3jSVi6yFW90rJMPucHVoZRbz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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