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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dc6a7f8ac7691c6135fd686e21a2ffa2c4775aa56b66ace2e3f267dc9f7b6c' 
  AND token = 'dO38QixLYojdkh9XDU8sZEbevPKMUYUK6bHEJ07FkQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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