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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1ddb57e9c8b3ce0ffaf78ae7f057af200521bd5e613e4a23db50532273b030' 
  AND token = 'l7/KmEB6xqTh72zrI3ZnOwCf1V0gxk1nW/mYJN86UoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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