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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b56241c00ba7e361a649fb67fff56e876d91b37977e4c5587431b3a0834d8d' 
  AND token = 'koZf5jPQ173EHy/fYIIte8wuuI659/q5nXZVs/nzhYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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