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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aafe019b018c47813e9e898dea91d38bb73fc5e50ad23b024d4408ee450d6b8d' 
  AND token = 'gWvQjF1WaewUFEPT5cWt5HbYxYht9Se5BW7VUQCoLRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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