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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd436f9eebca0c8e3cbfda2583284fd659c59087b4c0d40fe5771a0c21b7e425' 
  AND token = 'emkGUIHrQ90BxGMRhIo271ryKPf67/ma3W3bGaM4KfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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