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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89169f8862d12c2c83fe80b5a84b25c8ced2292a28434f24b76d4df0ed4698f5' 
  AND token = 'kUsybJGYcr6t4AnOTDRpEqG1X0g/I6gFN+DFyzUNGl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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