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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a8e7dfd08c0977f7eda9335b2210491604827233c06e60bd53a083a9170caf' 
  AND token = 'xja0YeITPYwJElQWIsFTNHzFQxr2V4yU7urCoIWoqwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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