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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c193f7fdb0001abd8520e66a4e211804f9fb6275dd54fdb44273eda439f6f454' 
  AND token = 'VIt8PWrvHvt6CbDg11D2MvKN7Fq8NO/kKgDrrBognJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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