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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5b658db1d05fd4296d2b7fbbf71a382c9d05c234b3cb10a165fbbd4e9ca832' 
  AND token = 'l+tkB4FdxGNCMJWWBTIrchxVhgrw/eMnBJ3TfoUdzsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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