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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808e1e47aaa17fdd024f4bb8d7e2351ff70f265c7c16e93cb574e67ab79ff1a4' 
  AND token = 'MI6oPqgnuyEU5ncm5SU22GGyfzb4ckTwrHyAj4gmiuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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