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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03852da63d70a129e6bd6e0c7b0a5b44f3234ea1b68e21e6dd74d53e32b5058' 
  AND token = 'LwMA9oj/h7B+NptaSiYIpIoA1raarwrhSKH70cfGQ+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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