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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade04ad4d09a43d82bcf54af38b7120a9b9b9297ff93fb3952b1052e3eabfb0b' 
  AND token = 'LrxfraWl2ld7KoHU1GmObYPLMAUvhG6S6P4U8hLw7J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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