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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09db3a0a59610f19108f50ef4c495e679e623af890d28bbded1a61bfd8d7195' 
  AND token = 'ScTVJw7RsmhCeIh5gw42/9ecWOIm89B2+20QJu2vm84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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