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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52206f5b207719625a4e7666d40c8760e1f13aa2a1ddbbb4107da7a4ba66ee5' 
  AND token = 'TXa4sM5VBrs5LKydSciFPXDrAkh07AuzTgxeEA4PdZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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