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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47b5dd17fe4af43982d6581bfc837a6d8e114fc44505c61d83d09bf7794f1bc' 
  AND token = 'YE1a3d24vf18CzdOAtcVs2QcIAmNQeMcI268wjIBrkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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