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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77caf730704ca05a362acef10c7d7b36953d40a514b6d9f7d9b2042f4c7ddb84' 
  AND token = 'faDphWc8bPOx5vzFeKrkIJO5hj7OohdA9ftKdwBbetk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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