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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb321ff24cc67bb674b9af682357e76003ad782fe2445617c072cd4143f1a73' 
  AND token = 'auZI+Io+649oA7SP6dw7zGuAqMEfjV9UU7VQTfcMZLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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