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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd113038125e7c24970f3fce7c5b605702f842cf1d1fd65d577c4ee52cadd28d0' 
  AND token = 'DtJxTSIz0A6kk2V9NoRvPX8ic9L8zfyRnQ/tnBlbkQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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