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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dcca2cb5b2413e391effdd83e08d72fc9ed0459a11730bc11f3a9b0ae9fd452' 
  AND token = 'uVKXdNenr5zYGT3uHEdDedu960GAate9KcQ67P4JOvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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