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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d499efbdb843f24ff29c74d4cd820a623c961d64776360cb735b0de79662ef1' 
  AND token = '63U6vNoov+wQmk4YuD4bz9pdM4DT8+rtY7SgK2JTFYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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