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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86d0f72edcd52375c1794233b00764a96b52322f1410ee5f569ae615846b374' 
  AND token = '55NQe51+3y3xjIoep2TDsgyNTD9GzzIhLYqZHJRydSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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