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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90bee3cbdee982b30d4a639678993a7352310f0d0f8485d60b9f9c328d231a23' 
  AND token = 'BbysV8QAyM9t+Kzb+Z5k/3wLumyVwQxCDEXxJw/EuHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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