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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b8babc82b2c29a50d63ffd305ebdc3457339f861c108a8a4357a42b2af117d' 
  AND token = 'Ou5MaX8ki5Rreo2dnklItR0AfwV6fSUJxh29fsvsjEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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