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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ab9ef4a79e763e688e0833bb95ae97ab9b49a677e3d843ca0b8e569fb2bbce' 
  AND token = '60dmURcMyNMLl4029hKIsYTB0Ha6Z+mI4npK50mKKi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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