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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79d62146b495b8b67a792b82565f2ac4d3e6b705ed5d1de1400df4cef9d5914d' 
  AND token = 'GF2LQRu6t1BMYDL368c0EkCViHreRLN6mI3sZqeA8gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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