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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcd3e30c14c28be146efde072048219be7d0a76c56c5b3554fd798c73b771d3' 
  AND token = 'ku+yDbBG/6aZDEKfUBdzB9/7DwV6/zd8+VvGk6V0pp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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