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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e9c6b02ec5265854fd366e3c9b3d6f8f154a04d097de905031c2fed943c3b7' 
  AND token = 'ZL/+QXGwmEbLDASYBNeRC38PYw0oal2bUQrruEtpz0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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