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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d1329c90825956f262faa7bf28846561f9f5b1988558ec29ef2f2327a4d74e' 
  AND token = 'UYmzyo/ZlOnKBYn2LeFay/+05yGZZeoAH7N0VXP07KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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