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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b07def9246cf517ebbd30a751b36fb85a734f444b44143527a3b14fb4d0d4a5' 
  AND token = 'SW6Im+g4JfEzxs8OR5ADS6/If+TJSGMEv/7wH83UzMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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