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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f8005ad270b7308b6be7f2e38f95da4b0032d9943fe5b8e0be2cf64a3abfed' 
  AND token = 'ZqBN7YnUmKB63brxN+nYS6qlR+SEeRK6wbnkkozDBZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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