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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f70a12e9bc7fb23bc5ac661d24e9c3f8524c778ce974119d3a17b9ce4309cc5' 
  AND token = '10eZQNx2mmoXXwodzRQz5ggl1ViyT2Acp4Vv36pdtJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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