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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fed17df2a8ea197746d59fc39a590981f48404166fb588dc21aff188fee668d' 
  AND token = '25M2vKRUis/DRyXhjpp2Xqx9MddLtFK0+Xj6boaPru8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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