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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c928050c7783a9f7995caa6c4bf00d84f2a4b9920ae4e86b2e0af6a9413bd7df' 
  AND token = 'QFzQIZ2U8xmQWB+QATk6OzeTFUFzNfuDBgJf+/r0+94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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