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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744613cb17c48ea861879a8e3099d4dd14647b592748297c7cd209eadeb3f8dc' 
  AND token = 'FE17pKYa7BuKMYq03nnYHm3UFasnyIW+TM45mGvRu+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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