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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b7c2300300dc7304919621ea1ad87f5198cd29942e2e97ce7b717de0646a0b' 
  AND token = 'a9ZKZSXFm0mARIil2m2F87cD3ruD4XNjXqvJiHv11v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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