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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6681e29f3dff8e9e34e5a4ba6faab92705e2dd97f1e530734961f7fd08150c7c' 
  AND token = 'AkO41QCDKn6AALdVbdowae/wJLBr2HHAstRIrjD8vkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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