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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a05f75bee2ae703e561aa7298084d7d20f5a3ad7df198824ef670b27c72a97c' 
  AND token = '6Ab24km+VQus3ZoPgL8xbwi7wdhGk+Xs64kP6KLeu/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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