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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a96aefdd1f1b3d5f0ce26e7eb8b5c05f5799d0d7c4c8aa19fab4e60e12ffae' 
  AND token = 'gFaW4V2mJ233WbyauS9e0F2J3vkvYwHOpc8OJm61FK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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