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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b99362ca99980beab5f4325d5a6e78595451fa92876397d2cdb4a7792de2ae' 
  AND token = 'BX9UkWSRiha+4TZWOjPWv7q771LQT9lZMbI8VqHHISg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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