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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe6f6089b821c70093531ad4dc27af2519a9950cf8df8835a7b4826369418ff' 
  AND token = 'CE/Z+9OyxOSN1FCfoOZzJzNu5B8eCAr1XqTcVmBA2OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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