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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b885c6ea9a70c9f9e4b7ceea80d38b67ac1f2ad0a26992d61ec887df0597f43' 
  AND token = 'aoY8LXnbvzW9pVnNWGFpT7ccfzr4dAvhgxF0wkTiiIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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