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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564778f5ce37968f62f0157694d4a68ea8bb4cc1f5e6b42a582da0ab877086c4' 
  AND token = 'u7Bil6wKEzKlBIxQFoiKdyWhoXgA8OhWT9mu0cw1TYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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