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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95b2b5fc175351670bf27d9cd0026db7fcdb2535878709a83a3f5131e37d7ae' 
  AND token = 'E069nN8H+k7ykKcHJuKZeqiwmnRVL4BTvN6vU3pskGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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