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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c7d85d9ebdf5414a520349892c139f070facd5154103931fbed9ba9c69faa6' 
  AND token = 'XL1anHavsai21AWtyISd8aP0K1lb0hitk9ZsdXo9Nsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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