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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832c67500363c109d15fc636da1e74ff8ab2d70217f82fe0e8df27f93ebdbaf9' 
  AND token = '/Tnnc3wX4Mux2gxp617PbrhJwGvw0pc7BbMUOFZSCm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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