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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3481d215818a9529afc304d6bd13e10851c013a9e9436e52b4b6cd946e3baf5a' 
  AND token = 'VjdbquN3MWgHpfGy0csUESRa/0Z1MYEsFtQ/uliPr9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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