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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9bb0beb9fd05f6c6674acd7846a01d7dc6d1ffc574c4d8664d7b9bad136507' 
  AND token = 'PyEz/4O+bxbdCn6BoNytGwENYgYwO7Q4JZIqkRz0ZQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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