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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dae542a283a56d8e559457b064748b2e1161fb5c6f7a6bd25976884700ecc8d' 
  AND token = 'NLq57+dR0xu2f+XQps9Jcdd5r286qYMzVSgZU5+tJeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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