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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83534f89ab7333b7d59ad16cd99cba4c9b0ff193b7eea9c6d5afd896acc3f3ce' 
  AND token = 'LKOx30Bv726bXpIMaUtex3y18OmHdKltfguJhK6uxD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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