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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27476e3aa82a1a2c7b94b963f0789a4c4c2ec6859cba4efce4fb61fcb3885766' 
  AND token = 'HN7MJdDtO3w0KFXiUmDyP0BQ4ADZU/XyjtjcdC8v4iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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