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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab28ed40436dff50dacc3408188f50292e1fcd9b86871f49e11ab8a5325576e3' 
  AND token = 'jLL4ihaxCnYyojaZOTHmrS3lL8R5rmA0mQ40y4S139w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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