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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac2567192e3b3b1607b9439c0dedb8ecb1218cbe2a94e76099eb624e1247d90b' 
  AND token = '9zjdFCFsQLBczl5TAg60WOOHkRy4kUnPkYAkE8poiYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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