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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0035971b67980266b14e9f9a962d6dcddf3f8f44577e9040f96351bcd8e2c203' 
  AND token = '0l42xJgMP9gj6vo/Z7qBnSqFM9GxbFDg7t3yNnMlqrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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