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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6eb64c47e8b1fa8213d25ffc6154ac712fa53ec55637ba2c233a081713e7a8' 
  AND token = 'lebKK+zj7thJUboZkjiwOI1vJSGYsdJa6SJ6FhOb6e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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