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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a07714ac9f75bd41404d9145d810c77d6f183af399f0d9122016837d313579' 
  AND token = 'kvSdtzLiN+cCvtucv/8gvlZTEkEQEQXxf/FzG8rbffE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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