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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '452fb7349d86275c627bf960d180ee4688f35eee076b249a0c8aa229f684d1c2' 
  AND token = 'W8HxfZq/H3yYMJbotVrkaE1BrVA0roZKKfTq4h5Z6SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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